I will say taking a turn at a high speed puts a good amount of stress on your body. I can feel that in my car when I take a turn too fast. Your forearm muscles and stabilizer muscles definitely feel it. Granted their bucket seats almost eliminate all of that, but no Power steering probably sucks (or do they still have that?). Now doing that turn 400 more times will definitely cause some physical exertion. Hell, that's why they drink Gatorade or whatever while driving.